Yazar "Altun, Ishak" için listeleme
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Almost Picard Operators
Altun, Ishak; Hancer, Hatice Aslan (Amer Inst Physics, 2019)The concept of Picard operator is one of the most important concept of fixed point theory. As known, a self mapping T of a metric space X is called Picard operator (PO) if it has unique fixed point and every Picard iteration ... -
Application of the Leray-Schauder alternative to nonlinear singular operator equations
Altun, Ishak; Koca, Kerim (Pergamon-Elsevier Science Ltd, 2009)In this paper, we study the problem of existence of solution of nonlinear singular integral equations of the form {w(z) = Phi(z) + T(G)F (., w (.), h (.)) (z) h(z) = Phi'(z) + Pi(G)F (., w (.), h (.)) (z), z is an element ... -
Caristi's Type Mappings On Complete Partial Metric Spaces
Acar, Ozlem; Altun, Ishak; Romaguera, Salvador (House Book Science-Casa Cartii Stiinta, 2013)We introduce a new type of Caristi's mapping on partial metric spaces and show that a partial metric space is complete if and only if every Caristi mapping has a fixed point. From this result we deduce a characterization ... -
Caristi-Type Fixed Point Theorems and Some Generalizations on M-Metric Space
Altun, Ishak; Sahin, Hakan; Turkoglu, Duran (MALAYSIAN MATHEMATICAL SCIENCES SOC, 2020)In this paper, taking into account Caristi's fixed point results on both metric spaces and partial metric spaces, we present their some extensions and generalizations on M-metric spaces. First, by providing a counter ... -
Characterizations of partial metric completeness in terms of weakly contractive mappings having fixed point
Altun, Ishak; Romaguera, Salvador (Univ Belgrade, Fac Electrical Engineering, 2012)We characterize both complete and 0-complete partial metric spaces in terms of weakly contractive mappings having a fixed point. Our results extend a well-known characterization of metric completeness due to SUZUKI and ... -
Ciric Type Generalized F-contractions on Complete Metric Spaces and Fixed Point Results
Minak, Gulhan; Helvaci, Asuman; Altun, Ishak (Univ Nis, Fac Sci Math, 2014)Recently, Wardowski [15] introduced the concept of F-contraction on complete metric space. This type contraction is proper generalization of ordinary contraction. In the present paper, we give some fixed point results for ... -
Common fixed point of a power graphic (F, psi)-contraction pair on partial b-metric spaces with application
Singh, Deepak; Chauhan, Varsha; Altun, Ishak (Inst Mathematics & Informatics, 2017)The aim of this paper is to inaugurate power graphic (F, psi)-contraction pair and to establish fixed point results for such mappings defined on partial b-metric spaces endowed with a graph. It is mentioning that, first ... -
Common Fixed Point Result In Ordered Cone Metric Spaces
Abbas, Mujahid; Altun, Ishak (Hacettepe Univ, Fac Sci, 2013)Fixed point and common fixed point results for generlized contractive mappings are obtianed in ordered cone metric spaces. -
Common Fixed Point Results for Generalized Wardowski Type Contractive Multi-Valued Mappings
Isik, Huseyin; Parvaneh, Vahid; Mohammadi, Babak; Altun, Ishak (Mdpi, 2019)In this paper, we introduce generalized Wardowski type quasi-contractions called alpha-(phi,Omega)-contractions for a pair of multi-valued mappings and prove the existence of the common fixed point for such mappings. An ... -
A COMMON FIXED POINT THEOREM FOR MULTIVALUED CIRIC TYPE MAPPINGS WITH NEW TYPE COMPATIBILITY
Altun, Ishak (Ovidius Univ Press, 2009)Kaneko and Sessa defined the concept of compatibility for multivalued mappings with Hausdorff metric and proved a coincidence point theorem. After then, Pathak defined the concept of weak compatibility and proved a coincidence ... -
A Common Fixed Point Theorem For New Type Compatible Maps On Partial Metric Spaces
Acar, Ozlem; Altun, Ishak (Math Soc Serbia-Drustvo Matematicara Srbije, 2015)In this paper, we introduce the concept of compatible maps of type (I) and of type (II) in partial metric space and prove a common fixed point theorem for four such maps on complete partial metric space. -
A COMMON FIXED POINT THEOREM FOR WEAKLY COMPATIBLE MAPPINGS IN SYMMETRIC SPACES SATISFYING AN IMPLICIT RELATION
Turkoglu, Duran; Altun, Ishak (Soc Matematica Mexicana, 2007)In this paper, we prove a common fixed point theorem for weakly compatible mappings in symmetric spaces satisfying an implicit relation and a fixed point thorems under strict contractive conditions, J. Math. Anal. Appl. ... -
A common fixed point theorem on ordered metric spaces
Nashine, Hemant Kumar; Altun, Ishak (Springer Singapore Pte Ltd, 2012)A common fixed point result for weakly increasing mappings satisfying generalized contractive type of Zhang in ordered metric spaces are derived. -
A Common Fixed Point Theorem On Ordered Partial S-Metric Spaces And Applications
Soursouri, Sima; Shobkolaei, Nabi; Sedghi, Sahaban; Altun, Ishak (KANGWON-KYUNGKI MATHEMATICAL SOC, 2020)A common fixed point result for weakly increasing mappings satisfying generalized contractive type in ordered partial S-metric spaces are derived. Also as an application of our results we consider a couple integral ... -
Common fixed point theorems for weakly increasing mappings on ordered uniform spaces
Altun, Ishak (Univ Miskolc Inst Math, 2011)In the present paper, we give a common fixed point theorem for two weakly increasing mappings on ordered Hausdorff uniform spaces, using the distance p: Two multivalued versions of this result are also presented. -
Common fixed point theorems on non-complete partial metric spaces
Sedghi, Shaban; Shobkolaei, Nabi; Altun, Ishak (Inst Mathematics & Informatics, 2013)In the peresent paper, we give a common fixed point theorem for four weakly compatible mappings on non-complete partial metric spaces. Some supporting examples are provided. -
Common fixed points of Ciric-type contractions on partial metric spaces
Abbas, Mujahid; Altun, Ishak; Romaguera, Salvador (Kossuth Lajos Tudomanyegyetem, 2013)We obtain a common fixed point theorem of Boyd-Wong type for four mappings satisfying a Ciric-type contraction on a complete partial metric space. Our result generalizes and unifies, among others, the very recent results ... -
Coupled fixed point theorems for contractions in fuzzy metric spaces
Sedghi, Shaban; Altun, Ishak; Shobe, Nabi (Pergamon-Elsevier Science Ltd, 2010)In the present work, we prove a coupled fixed point theorem for contractive mappings in complete fuzzy metric spaces. (C) 2009 Elsevier Ltd. All rights reserved. -
Cyclic phi-contractions on S-complete Hausdorff uniform Spaces
Sedghi, Shaban; Shobkolaei, Nabi; Firouzian, Siamak; Altun, Ishak (Academic Publication Council, 2015)In this paper, we apply the concept of cyclic phi-contraction for presenting a fixed point theorem on a Hausdorff uniform space. -
An extension of Assad-Kirk's fixed point theorem for multivalued nonself mappings
Altun, Ishak; Minak, Gulhan (North Univ Baia Mare, 2016)In the present paper, taking into account the recent developments on the theory of fixed point, we give some fixed point results for multivalued nonself mappings on complete metrically convex metric spaces. Our main result ...